d70b84a9d68c8af494a84011f15750c8 English dataset Data Archive for Seabed Species and Habitats (DASSH) Data Manager 01752 633102 01752 633291 Marine Biological Association of the UK, The Laboratory, Citadel Hill Plymouth PL1 2PB dassh.enquiries@mba.ac.uk pointOfContact 2019-08-12 MEDIN Discovery metadata standard 2.3.8 urn:ogc:def:crs:EPSG::4258 1998-2001 Isle of Man long-term effects of scallop dredging: re-analysis of historical data 2002-12-31 publication 1998-01-01 creation 2002-12-31 revision MRMLN00100000047 http://www.dassh.ac.uk Benthic marine species abundance data from surveys undertaken in the Isle of Man. 9999 denotes colonial species. Between 1938 and 1952, Norman Jones (a benthic ecologist based at Port Erin Marine Laboratory (PEML))collected over 200 benthic samples from all around the south of the Isle of Man. Many of these samples pre-date the start of the commercial scallop fishery, so provide an important baseline with which to compare present day benthic fauna. Seven sites, where Jones recorded the highest density of samples, were selected and re-sampled during 1998-1999. Community composition and sediment size had changed at all sites. Mobile, robust and scavenging taxa had increased in abundance while slow moving, sessile and fragile taxa had decreased in abundance. Differences between historical and modern samples were greater than could be accounted for by natural variability of the system and indicate real long term change. C. Bradshaw Port Erin Marine Laboratory (PEML), University of Liverpool Port Erin IM9 6JA dassh.enquiries@mba.ac.uk originator Data Archive for Seabed Species and Habitats (DASSH) Data Manager 01752 633102 01752 633291 Marine Biological Association of the UK, The Laboratory, Citadel Hill Plymouth PL1 2PB dassh.enquiries@mba.ac.uk custodian notPlanned Database Delimited Marine Environmental Data and Information Network Geology Habitats and biotopes Land use Species distribution GEMET - INSPIRE themes, version 1.0 2008-01-06 revision Macroalgae generic abundance in water bodies Zoobenthos generic abundance Fauna abundance per unit area of the bed Shellfish abundance and biomass in water bodies Habitat extent Habitat characterisation Industrial activity Macroalgae and seagrass taxonomy-related counts Sediment grain size parameters SeaDataNet P021 parameter discovery vocabulary 2009-11-16 revision Released under DASSH terms and conditions otherRestrictions Released under DASSH terms and conditions https://www.dassh.ac.uk/terms-and-conditions English geoscientificInformation biota planningCadastre biota Charting Progress 2 Sea Areas 2009-06-18 creation Irish Sea -5.2289 -3.9387 53.8098 54.5799 1998-01-01 2001-12-31 Bradshaw, Veale, Brand (2002) The role of scallop-dredge disturbance in long-term changes in Irish Sea benthic communities: a re-analysis of an historical dataset. Journal of Sea Research. Vol. 47, 161-184. Data Archive for Seabed Species and Habitats (DASSH) Data Manager 01752 633102 01752 633291 Marine Biological Association of the UK, The Laboratory, Citadel Hill Plymouth PL1 2PB dassh.enquiries@mba.ac.uk distributor dataset Between 1938 and 1952, Norman Jones (a benthic ecologist based at Port Erin Marine Laboratory (PEML) collected over 200 benthic samples from all around the south of the Isle of Man. Many of these samples pre-date the start of the commercial scallop fishery, so provide an important baseline with which to compare present day benthic fauna. Seven sites, where Jones recorded the highest density of samples, were selected and re-sampled during 1998-1999. 24 grabs and 6 beam trawls were taken at each site. All animals were identified and counted. Multivariate and univariate analysis was used to compare community change over time and to examine the possible effect of scallop fishing over 60 years. Community composition and sediment size had changed at all sites. Mobile, robust and scavenging taxa had increased in abundance while slow moving, sessile and fragile taxa had decreased in abundance. Differences between historical and modern samples were greater than could be accounted for by natural variability of the system and indicate real long term change.